An organism is discovered that consumes a considerable amount of sugar, yet does not gain much weight when denied air. Curiously, the consumption of sugar increases as air is removed from the organism's environment, but the organism seems to thrive even in the absence of air.When returned to normal air, the organism does fine. Which of the following best describes the organism?

A) It mustuse a molecule other than oxygen to accept electrons from the electron transport chain.

Phosphofructokinase is an allosteric enzyme that catalyzes the conversion of fructose-6- phosphate to fructose-1,6-bisphosphate, an early step of glycolysis. In the presence of oxygen, an increase in the amount ATP in a cell would be expected to

A) inhibit the enzyme and thus slow the rates of glycolysis and the citric acid cycle.

B) activate the enzyme and thus slow the rates of glycolysis and the citric acid cycle.

C) inhibit the enzyme and thus increase the rates of glycolysis and the citric acid cycle.

D) activate the enzyme and increase the rates of glycolysis and the citric acid cycle.

E) inhibit the enzyme and thus increase the rate of glycolysis and the concentration of citrate.

A) inhibit the enzyme and thus slow the rates of glycolysis and the citric acid cycle.